Excellent process from top to bottom--one of the reasons I took the position offered was the treatment/professionalism of the HR staff (especially compared to other public health organizations).
After applying online in mid-May 2015, I passed an initial email screen and then was contacted by a recruiter. Next came a phone screen/interview, at the end of which I was asked to fly out to DC the following week for an in-person interview. PATH graciously paid for all expenses (airfare, meals, etc.) and had a very responsive HR person assigned to answer any questions/needs that arose.
The group interview in DC took around 2 hours; everyone was friendly, accommodating, and professional. Afterwards I was told that if I was selected to be a finalist I would be informed within a week about a final telephone interview with the Seattle office. Instead I was told within 2 days and a phone call was arranged.
Third interview was relatively short, only about 45 minutes. Again I was told it would be approximately a week before I would hear; four days later I was contacted and an offer was made.